welcome to the forum.
To help you it will be necesarry that you provide a bit more information. What OS (if you use .bat it should be Windows but which) and what version of JBoss AS7?
Is it a fresh download without changes?
What you might do is to change the first line of the standalone.bat, replace @echo off => @echo on. You will see more details about the executed batch script.
If you not sure what goes wrong you can attach the output of the command.
Finally, I installed a JRE 6 and set the JAVA_HOME accordingly.
Indeed, for AS7 you have to use Java6.
Do you have your installation running now?
Yep, the webpage opens up.
It would be perfect if you mark the thread as answered to see it in the thread list